» Family Perlidae (Golden Stones)
10 genera aren't included.
This is page 4 of specimens of Perlidae. Visit the main Perlidae page for:
- The behavior and habitat of Perlidae.
Pictures of 41 Stonefly Specimens in the Family Perlidae:
Hesperoperla pacifica (Golden Stone) Stonefly Nymph
View 1 PicturesThis monster started to feed within a few minutes of sharing the inspection tray with its victims. This nymph is a voracious predator of small invertebrates and has even been noted for feeding on small fish and salmonid alevins. The niche it fills in fast water is equivalent to the Dragonfly nymphs that inhabit slower water.
Hesperoperla pacifica nymphs are easily distinguished from other western perlids by the presence of anal gills (obfuscated by algae in the tray) in combination with an hour glass shaped pale mark on the front of their heads.
Hesperoperla pacifica (Golden Stone) Stonefly Adult
View 14 PicturesI collected this specimen as a nymph and had it in line to be photographed, but it emerged inside my holding container before I got the chance. However, I was able to get some interesting photos of the very freshly-emerged adult that really demonstrate how strikingly colors can change within a few short hours after emergence. The before-and-after pictures are combined here under a single specimen since they portray the same individual at different times within the same stage.
Based on the identification of another specimen from the same date/site, I'm calling this Hesperoperla pacifica.